>TIGR00932 2a37 transporter, monovalent cation:proton antiporter-2 (CPA2) family; InterPro: IPR004771 Na^+/H^+ exchange proteins eject protons from cells, effectively eliminating excess acid from actively metabolising cells. Na^+/H^+ exchange activity is also crucial for the regulation of cell volume, and for the reabsorption of NaCl across renal, intestinal, and other epithelia. These antiports exchange Na^+ for H^+ in an electroneutral manner, and this activity is carried out by a family of Na^+/H^+ exchangers, or NHEs, which are known to be present in both prokaryotic and eukaryotic cells. In mammalian cells, Na^+/H^+ exchange activity is found in both the plasma membrane and inner mitochondrial membrane. To date, six mammalian isoforms have been identified (designated NHE1-NHE6) , . These exchangers are highly-regulated (glyco)phosphoproteins, which, based on their primary structure, appear to contain 10-12 membrane-spanning regions (M) at the N-terminus and a large cytoplasmic region at the C-terminus. The transmembrane regions M3-M12 share identity with other members of the family. The M6 and M7 regions are highly conserved. Thus, this is thought to be the region that is involved in the transport of sodium and hydrogen ions. The cytoplasmic region has little similarity throughout the family. There is some evidence that the exchangers may exist in the cell membrane as homodimers, but little is currently known about the mechanism of their antiport . The monovalent Cation:Proton antiporter-1 (CPA1) family is a large family of proteins derived from Gram-positive and Gram-negative bacteria, blue green bacteria, yeast, plants and animals. This family represent the K(+)/H(+) antiporter. ; GO: 0008324 cation transmembrane transporter activity, 0006812 cation transport, 0016021 integral to membrane.

Probab=96.52  E-value=0.055  Score=30.53  Aligned_cols=98  Identities=12%  Similarity=0.201  Sum_probs=41.7

Q ss_pred             HHHHHHHHHHHHHHHHCCHHHHHHHHHHHHHHHHHHHHHH----HHHHHHHHCCCCCCHH---------HHHHHHHHHCC
Q ss_conf             6899999999886531147988620256777765554221----2232110002558799---------99998643212
Q gi|254780924|r  285 LRDAFSVLFFISVGMMFNPDILISNPILLMMAVIIVIIGK----ALIAFIVVIAFGRSVA---------TALTIAASLSQ  351 (609)
Q Consensus       285 ~~~~~~~~fFv~iG~~l~~~~l~~~~~~~l~~~~~~~~~k----~~~~~~~~~~~~~~~~---------~~~~~g~~l~~  351 (609)
T Consensus        63 laE~GV~lLmF~~GLE~d~~~L~~~~k~~~~~g~lq~~~~~GfG~ll~~~~~~~~g~~~~GeRHikfsv~a~~~G~~L~~  142 (314)
T TIGR00932        63 LAELGVILLMFLIGLELDLERLKKLRKAAFGVGVLQVLVSGGFGVLLGLLLGHLLGLALGGERHIKFSVAAVVIGIILAL  142 (314)
T ss_pred             HHHHHHHHHHHHHHHHCCHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHCCCCCCCCHHHHHHHHHHHHHHHHH
T ss_conf             98888999999988732889999999999722077642226789999999999850357886025788999999999999


Q ss_pred             CCHHHHHHHHHHHHCCCCCHHHHHHHHHHHHHH
Q ss_conf             202567889887641787866877877888999
Q gi|254780924|r  352 IGEFSFILANLGVELGILPDQARDLILASSIIS  384 (609)
Q Consensus       352 ~g~~~~v~a~~a~~~g~i~~~~~~~i~~~~~~s  384 (609)
T Consensus       143 ~S-ta-v~~~~L~E~~~~~~~~G~~~l~~l~~~  173 (314)
T TIGR00932       143 SS-TA-VVVQVLKERNLLKTREGQTVLGILLFQ  173 (314)
T ss_pred             HH-HH-HHHHHHHHCCCCCCHHHHHHHHHHHHH
T ss_conf             99-99-999998650533346789999999999